1 /*
2 * SAT4J: a SATisfiability library for Java Copyright (C) 2004-2006 Daniel Le Berre
3 *
4 * Based on the original minisat specification from:
5 *
6 * An extensible SAT solver. Niklas E?n and Niklas S?rensson. Proceedings of the
7 * Sixth International Conference on Theory and Applications of Satisfiability
8 * Testing, LNCS 2919, pp 502-518, 2003.
9 *
10 * This library is free software; you can redistribute it and/or modify it under
11 * the terms of the GNU Lesser General Public License as published by the Free
12 * Software Foundation; either version 2.1 of the License, or (at your option)
13 * any later version.
14 *
15 * This library is distributed in the hope that it will be useful, but WITHOUT
16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
18 * details.
19 *
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this library; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 */
25 package org.sat4j.reader.csp;
26
27 import org.sat4j.core.VecInt;
28 import org.sat4j.specs.ContradictionException;
29 import org.sat4j.specs.ISolver;
30 import org.sat4j.specs.IVec;
31 import org.sat4j.specs.IVecInt;
32
33 public class Nogoods implements Relation {
34
35 private final int[][] tuples;
36
37 private final int arity;
38
39 public Nogoods(int arity, int nbtuples) {
40 tuples = new int[nbtuples][];
41 this.arity = arity;
42 }
43
44 public void addTuple(int index, int[] tuple) {
45 tuples[index] = tuple;
46 }
47
48 public void toClause(ISolver solver, IVec<Var> scope, IVec<Evaluable> vars)
49 throws ContradictionException {
50 IVecInt clause = new VecInt();
51 for (int i = 0; i < tuples.length; i++) {
52 clause.clear();
53 for (int j = 0; j < scope.size(); j++) {
54 clause.push(-scope.get(j).translate(tuples[i][j]));
55 }
56 // System.err.println("Adding clause (EZ) :" + clause);
57 solver.addClause(clause);
58 }
59 }
60
61 public int arity() {
62 return arity;
63 }
64 }